Cleanup TP converter unit test processing script and do not fall-back on AFS

Tadej Novakrequested to merge
tadej/athena:tp-test into 24.0

Cleanup TP converter unit test processing script and do not fall-back on AFS. We should phase-out AFS for files and CVMFS should be used. Actually it was already used but some files got corrupted and it silently used AFS instead for some tests. I recovered the relevant files from AFS.

/cc @jchapman

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